Hum... interesting sensors. I have a little assumption here about the noise, but i'm really not sure of this. have an 4.7k between PIC and sensor, one .1uF between PIC ADC input and ground.

i'm curious to see what goes out of the sensor with a scope when there's no current flow on the TAB sensor.

maybe pull-down resistor at the sensor output can also do something...

sensor out=max 10ma

regards